The Dead Sea is so salty that you cannot sink in it.
Its water is about 34 percent salt, nearly ten times saltier than the ocean, and much denser than a human body. Swimmers float on the surface like corks and can read a newspaper lying on their backs.
Why is this true?
The Dead Sea sits in a desert with no outlet, so water leaves only by evaporation and the salt stays behind. Its shore is the lowest point on land, more than 430 metres below sea level, and it is still dropping.
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Science and nature supply facts that feel like they break the rules until you see the mechanism. Hot water freezing before cold, glass that flows, lightning hotter than the surface of the Sun. Each entry keeps the physics or chemistry short and readable, states plainly where the effect is still debated, and links to a source for anyone who wants the full derivation rather than the headline.